欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入 在网上看过很多版本的PHP异步请求方法,这里简单总结几个常用方法分享给大家 1、用CURL实现一步请求 CURL扩展是我们在开发过程中最常用的一种方法,他是一个强大的HTTP命令行工具,可以模拟POST/GET
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在网上看过很多版本的PHP异步请求方法,这里简单总结几个常用方法分享给大家
1、用CURL实现一步请求
CURL扩展是我们在开发过程中最常用的一种方法,他是一个强大的HTTP命令行工具,可以模拟POST/GET等HTTP请求,然后得到和提取数据,显示在"标准输出"(stdout)上面。
示例:
[php]
$cl = curl_init();
$curl_opt = array(CURLOPT_URL, 'http:///demo.php',
CURLOPT_RETURNTRANSFER, 1,
CURLOPT_TIMEOUT, 1,);
curl_setopt_array($cl, $curl_opt);
curl_exec($ch);
curl_close($ch);
?>
由于CUROPT_TIMEOUT属性最小值为1,这就意味着在客户端必须等待1秒,这也是使用CURL方法的缺点
2、用popen()函数实现异步请求
语法格式:popen(command,mode)
示例:
[php]
$file = popen("/bin/ls","r");
//这里是要执行的代码
//…
pclose($file);
?>
popen()函数直接打开一个指向进程的管道,速度快,即时相应。但是这个函数是单项的,要么读要么写,而且如果并发数较大,则会产生大量进程,给服务器造成负担。
另外,如同示例中一样,程序结束后一定要用pclose()来关闭。
3、用fscokopen()函数实现异步请求
我们在平时开发邮件发送功能等socket编程时,都会用到这个函数,在使用这个函数之前,我们要在PHP.ini 中开启 allow_url_fopen 选项,另外在变成时,我们还要自己手动拼接出header部分。
示例:
[php]
$fp = fsockopen("/demo.php", 80, $errno, $errstr, 30);
if (!$fp) {
echo "$errstr ($errno)
\n";
} else {
$out = "GET /index.php / HTTP/1.1\r\n";
$out .= "Host: \r\n";
$out .= "Connection: Close\r\n\r\n";
fwrite($fp, $out);
/*这里忽略执行结果
*测试时可以打开
while (!feof($fp)) {
echo fgets($fp, 128);
}*/
fclose($fp);
}
PHP本身没有多线程,但是我们可以用其他方式来实现多线程的效果,上面列举的三种方式都有各自的优缺点,大家在使用时可以根据程序的需要择优选择。

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